why does my BMW 5 Series AC only blow hot air?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Recharge Refrigerant

• Tools Required: Manifold gauge set, refrigerant canister
• Connect the manifold gauges to the low and high-pressure ports on the AC system.
• Check the pressure readings; if low, proceed to recharge the system.
• Attach the refrigerant canister to the low-pressure port and add refrigerant according to manufacturer specifications.
• Monitor the gauges while adding refrigerant to avoid overcharging.

3. Check the AC Compressor

• Tools Required: Multimeter, socket set
• Locate the AC compressor and check the electrical connections.
• Use a multimeter to test the compressor clutch for power; if no power, trace wiring for faults.
• If the compressor is faulty, remove it using a socket set and replace it with a new unit.

4. Replace Cabin Air Filter

• Tools Required: Screwdriver (if applicable)
• Locate the cabin air filter housing, typically behind the glovebox.
• Open the housing and remove the old filter.
• Install a new cabin air filter, ensuring proper orientation.

5. Reconnect Battery and Test System

• Reconnect the vehicle's battery.
• Start the engine and turn on the AC to test for proper cooling function.